Just how many activity trackers can this emerging, but admittedly niche market support? We have no idea, but Withings is hoping that there's room for at least one more. The company will be releasing the Pulse tomorrow for $99, and taking on veterans of the scene like Fitbit and relative newcomers like Jawbone. The tiny device counts steps, monitors your sleep patterns and can even measure your heart rate. Unfortunately, it can't do the latter constantly and in real time, though, that might be a slightly unrealistic expectation of any tracker. Like some of Fitbit's products it can also monitor your altitude, which is great for people who want to know how many steps they've climbed. The Pulse itself is quite small, about the size of standard issue pedometer and almost as light. The casing is made of a nice soft touch plastic that feels down right lovely in the hand, which is good since you'll be manhandling the Pulse more than most other trackers. It's a far cry from the glossy piano black finish it sported at CES.